Some titrations requires the solution to be boiled due to the CO2 created from the acid-base reaction. The CO2 forms carboinic acid (H2CO3) when dissolved in water. The carbonic acid then acts as a buffer, reducing the accuracy of data. After boiling water, most of the CO2 will be removed from the solution allowing the solution to be titrated to a more accurate endpoint. The endpoint is the point where all of the analyte has be reacted with the reagent.